单项选择题

Studies conducted during the 1970s on prents－children reltionship indicted tht ______.Stud

ies conducted during the 1970s on prents-children reltionship indicted tht ______.dolescence did not cuses much troubles clinicinsnd theorists hd stted B．children’sggressivenessnd rebelliousness were growing C．children-prents reltionship ws declining D．teengers becme even morebhorrent of their prentsA．adolescence did not cause as much trouble as clinicians and theorists had statedB．children’s aggressiveness and rebelliousness were growingC．children-parents relationship was decliningD．teenagers became even more abhorrent of their parents

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某300MW并网运行的机组的δ=6%，在电网频率从49.8Hz升到50Hz时，机组的功率变化为（）。A、20M...

单项选择题某300MW并网运行的机组的δ=6%，在电网频率从49.8Hz升到50Hz时，机组的功率变化为（）。

A、20MW
B、12MW
C、10MW
D、15MW

根据材料请回答 16～22 SmokingSince 1939, numerous studies have ...

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材料请回答 16～22 Smoking Since 1939, numerous studies have been conducted to determine whether smoking is a health hazard.The trend of the evidence has been consistent and indicates that there is a serious health risk.Research teams have conducted studies that show beyond all reasona-ble doubt that tobacco smoking is associated with a shortened life expectancy （）And low tar tobacco are claimed to make smoking to some extent sa-fer, but they can only slightly reduce,not eliminate,the hazards．第 16 题 It is easy to determine whether smoking is hazardous． A．RightB．WrongC．Not mentioned

BookStore数据库中有客户表Customer(CustomerCode, Name, Sex, Home...

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A、*
B、CustomerCode, Name, Hometown, Sex, Email, Telephone, LoginTime, PassWord
C、CustomerCode, Hometown, Telephone, Name, Sex, Email, LoginTime, PassWord
D、CustomerCode ~ PassWord